Submit the answers to the checkpoint questions in the text box with the Lesson Review.
Part A Checkpoint
Directions: Complete each of the following questions.
(PICTURE FOR THE FIRST QUESTION)

1. Indicate the kind of energy represented in each example below:
a. Burning fuel in a car
b. Exploding an atomic bomb
c. Current moving in a wire
d. Tires sliding on pavement when brakes are applied
e. Football player running for a touchdown

2. All forms of energy except nuclear fission come from the _________.



3. Energy is ______________.

Answer:

Decomposition begins at the moment of death, caused by two factors: 1.) autolysis, the breaking down of tissues by the body's own internal chemicals and enzymes, and 2.) putrefaction, the breakdown of tissues by bacteria.

Explanation:

hope it will help you

Answer:

Moles of substance are defined ratio of the given mass of the substance to the molar mass of the substance.

Given :

The 52.06 grams of carbon dioxide.

To find :

The moles of carbon dioxide.

Solution:

The mass of carbon dioxide = 52.06 g

The molar mass of carbon dioxide = 44.01 g/mol

The moles of carbon dioxide:

1.183 moles of carbon dioxide are there in 52.06 g of carbon dioxide.

Explanation:

Answer:

ITS B

Explanation:

MY CONSCIOUS MIND IS TELLING ME

Answer:

Like Earth, it gets plenty of sunlight. We don’t see the far side because “the moon is tidally locked to the Earth,” said John Keller, deputy project scientist for NASA’s Lunar Reconnaissance Orbiter project. “The moon does rotate, but it rotates at the same speed that it rotates around the Earth.”

Explanation:

Answer:

During DNA replication, each of the two strands that make up the double helix serves as a template from which new strands are copied. The new strand will be complementary to the parental or “old” strand. Each new double strand consists of one parental strand and one new daughter strand.

Explanation:

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There is no reaction when you add catalase to sucrose.

Sucrose is a disaccharide that consist of glucose and fructose. Both glucose and fructose are hexoses.

Owing to the fact that catalase is specific to sucrose, there is no reaction when you add catalase to sucrose.

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Answer:

I think B sorry if wrong

Explanation:

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3H₂SO₄ + 2Al₂(SO₄)₃  → Al₂(SO₄)₃ + 3H₂ is the balanced chemical equation that represents a single displacement reaction.

The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.

3H₂SO₄ + 2Al₂(SO₄)₃  → Al₂(SO₄)₃ + 3H₂

In this type of reaction, one substance is replacing another:

A + BC  →  AC + B

In a single displacement reaction, atoms replace one another based on the activity series. Elements that are higher in the activity series. Also, if the element that is to replace the other in a compound is more reactive the reaction will occur. If it is less reactive, there will be no reation.

In the first equation, fluorine is more reactive than bromine. Therefore, bromine cannot replace bromine.

In the second equation, the displacement is between hydrogen and aluminium. Hydrogen is lower in the activity series, this implies that aluminium will replace it.

Hence, 3H₂SO₄ + 2Al₂(SO₄)₃  → Al₂(SO₄)₃ + 3H₂ is the balanced chemical equation that represents a single displacement reaction.

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Answer:

8 valence electrons

Explanation:

The molarity of the resulting solution obtained by diluting the stock solution is 3 M

M₁V₁ = M₂V₂

15 × 500 = M₂ × 2500

7500 = M₂ × 2500

Divide both side by 2500

M₂ = 7500 / 2500

M₂ = 3 M

Thus, the volume of the resulting solution is 3 M

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Answer: Infiltration

Explanation: it is the process by which surface water, rainwater or snowmelt seeps into the ground

A 3.4 × 10⁶ L swimming pool must have a mass of 1.0 × 10⁷ mg Cl₂ to maintain a concentration of 3.0 ppm.

"ppm" of "parts per million" is a unit of concentration equivalent to milligrams of solute per liters of solution.

A pool must maintain a chlorine concentration of 3.0 ppm (3.0 mg/L). The mass of chlorine in 3.4 × 10⁶ L is:

3.0 mg Cl₂/L × 3.4 × 10⁶ L = 1.0 × 10⁷ mg Cl₂

A 3.4 × 10⁶ L swimming pool must have a mass of 1.0 × 10⁷ mg Cl₂ to maintain a concentration of 3.0 ppm.

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An ice storm is a temperature below freezing resulting from large amount of snow falling, i.e., options A and B.

Freezing rain causes ice storms. Raindrops travel into a tiny layer of below-freezing air near the earth's surface, where they freeze on contact with the ground, trees, automobiles, and other things.

Ice forms when cold rain freezes in contact with surfaces below the freezing point.

Thus, the correct options A and B.

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Answer:

So A: an addition to a base sequence at the beginning of a gene

Explanation:

This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.

Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit.

One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF.

Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy.

Hence, lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.

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Answer:

0.24%

Explanation:

A toothpaste contains 0.24% by mass sodium fluoride (NaF) used to prevent dental caries and 0.30% by mass triclosan, C12H7Cl3O2, a preservative and antigingivitis agent. One tube contains 119 g of toothpaste. (6.4, 6.5) Components in toothpaste include triclosan and NaF.a. How many moles of NaF are in the tube of toothpaste?b. How many fluoride ions (F?) are in the tube of toothpaste?c. How many grams of sodium ion (Na+) are in 1.50 g of toothpaste?d. How many molecules of triclosan are in the tube of toothpaste?Solution 124CQStep 1 of 4:Given:Mass of toothpaste = 119 g. Mass percent of sodium fluoride (NaF) = 0.24%Mass percent of triclosan (C12H7Cl3O2) = 0.30%a. Here, we are asked to find the number of moles of NaF in the tube of toothpaste.Mass percent of sodium fluoride (NaF) = 0.24%First, let’s find the mass of NaF in the tube: = 119 g = 0.2856 grams Molar mass of NaF = 41.98 g/mol This means, 1 mol NaF = 41.98 g. So, the mole-mass factor is: and Therefore, number of moles of NaF will be: = 0.2856 g NaF = 0.00680 mol NaFHence, the number of moles of NaF in 119g toothpaste is 0.00680 moles. ________________

According to mole concept, there are 41.988 grams   in 1 mole NaF that is sodium fluoride.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles is given by the formula, mass/molar mass and hence mass= 1×41.988= 41.988 g.

Thus, there are 41.988 g in 1 mole NaF.

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The new volume of the gas given the data from the question is  1/2X mL

Data obtained from the question

Initial volume (V₁) = X mL

Initial pressure (P₁) = 2 atm

New pressure (P₂) = 4 atm

New Volume (V₂) = ?

How to determine the new volume

The new volume of the gas can be obtained by using the Boyles’ law equation as illustrated below:

P₁V₁ = P₂V₂

2 × X = 4 × V₂

2X = 4V₂

Divide both side by 4

V₂= 2X / 4

V₂ = 1/2X mL

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If the mass number of an atom is 29, and it has 13 protons and 13 electrons, the identity of this atom is Aluminum.

An atom is the smallest indivisible particle of an element which still retains its chemical identity.

An atom consists of a nucleus surrounded by electrons. The nucleus is made up of protons and neutrons.

The identity of a chemical element is determined by its electron and proton number, which is the same for a neutral atom.

According to this question, the atom of an element has 13 protons and 13 electron. This suggests that the atom is that of Aluminum.

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Answer:

270 million

Explanation:

1/2 ^n  = .15            (.15 is 15% in decimal)

                    log both sides

n log (1/2) = log (.15 )

   n = 2.737 half lives

EACH half life is 100 million

      2.737 * 100 million = 273.7 million

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An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton). All atoms are roughly the same size. A convenient unit of length for measuring atomic sizes is the angstrom (Å), which is defined as 1 x 10-10 meters. The diameter of an atom is approximately 2-3 Å.

In 1897, J. J. Thomson discovered the existence of the electron, marking the beginning of modern atomic physics. The negatively charged electrons follow a random pattern within defined energy shells around the nucleus. Most properties of atoms are based on the number and arrangement of their electrons. The mass of an electron is 9.1 x 10-31 kilograms.

One of the two types of particles found in the nucleus is the proton. The existence of a positively charged particle, a proton, in the nucleus was proved by Sir Ernest Rutherford in 1919. The proton's charge is equal but opposite to the negative charge of the electron. The number of protons in the nucleus of an atom determines what kind of chemical element it is. A proton has a mass of 1.67 x 10-27 kilograms.

The neutron is the other type of particle found in the nucleus. It was discovered by a British physicist, Sir James Chadwick. The neutron carries no electrical charge and has the same mass as the proton. With a lack of electrical charge, the neutron is not repelled by the cloud of electrons or by the nucleus, making it a useful tool for probing the structure of the atom.

Even the individual protons and neutrons have internal structure, called quarks. Six types of quarks exist. These subatomic particles cannot be freed and studied in isolation. Current research continues into the structure of the atom.

Moles of Hg

2 moles produce 1 mol O2

1 mol produces 1/2mol O_2

0.006 mol produces

Answer:

carbon and hydrogen atoms

The result of preventing spindle fibers from forming is mitotic division stops in metaphase and cannot proceed to anaphase.

Colchicine is a drug use to remove swelling and decrease the amount of uric acid production.

It prevents the formation of spindle fibers during the cell cycle.

Thus, the correct option is C.

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Answer:

E:ammonium chloride

F:sodium hydroxide

G:ammonia

Soda water, wood, air, soil, vinegar, filtered tea.

Answer:

Homogeneous mixtures : Soda water, vinegar and filtered tea. Heterogeneous mixtures : Wood and soil.

Scientists use scientific notation to communicate extremely small measurements. Hence, option A is correct.

Scientific notation is a way of writing very large or very small numbers.

Scientists use scientific notation to represent very small or very large numbers because this notation increases the  

Hence, option A is correct.

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Answer:

x+y = 12

Explanation:

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Answer:

11.40x10-7

Explanation:

9.80+1.60x10-3-4

11.40x10-7